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Exposure controlling apparatus

  • US 5,162,841 A
  • Filed: 10/05/1990
  • Issued: 11/10/1992
  • Est. Priority Date: 10/11/1989
  • Status: Expired due to Term
First Claim
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1. An exposure controlling apparatus comprising:

  • a sensor for effecting photometry by separating light from an original picture into a plurality of separated components;

    storage means for storing a value characteristic of the spectral sensitivity of said sensor and a value characteristic of the spectral sensitivity of a sensitive material to which an image is copied thereon;

    estimating means for estimating a spectral characteristic of the original picture on the basis of a photometric value of said sensor and the value characteristic of the spectral sensitivity of said sensor stored in said storage means; and

    controlling means for determining a synthetic value which is equivalent to a value measured by a sensor having a spectral sensitivity distribution identical with or similar to a spectral sensitivity distribution of the sensitive material on the basis of the spectral characteristics of the original picture estimated and the value characteristic of the spectral sensitivity of the sensitive material, and for controlling exposure amount on the basis of the synthetic value.

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